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Caused by:
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org.springframework.beans.factory.BeanCreationException: Error creating bean with name
'userRepository': Invocation of init method failed;
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nested exception is java.lang.IllegalArgumentException: Not a managed type:
class com.heima.domain.User
bean注入失败,简单来说就是在加载SpringBoot 的启动类时JPA的实体类找不到,没有被扫描到。导致这样的情况有以下几种可能。
1、实体类上缺少@Entity注解---在实体类上加上注解即可
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@Entity
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public
class User {
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// 主键
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@Id
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@GeneratedValue(strategy = GenerationType.IDENTITY)
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private Long id;
2、 没有按照SpringBoot的约定,默认扫描(SpringBootApplication.java 启动类相对的兄弟包及其子包)
解决方案:
2.1 将SpringBootApplication.java(启动类)放置到更高层级的包,使得项目结构符合SpringBoot约定扫描的规则
2.2 在启动类中添加要扫描的包
2.2.1 @ComponentScan(basePackages = "com.boot.demo.xxx.*.*")
用于扫描@Controller @Service
2.2.2 @EnableJpaRepositories(basePackages = "com.boot.demo.xxx.*.dao")
用于扫描Dao @Repository
2.2.3 @EntityScan("com.boot.demo.xxx.*.*")
用于扫描JPA实体类 @Entity
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@SpringBootApplication
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@EntityScan(
"com.heima.domain")
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public
class SpringbootJpaApplication {
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public static void main(String[] args) {
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SpringApplication.run(SpringbootJpaApplication.class, args);
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}
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}